1 | this.workbox = this.workbox || {};
|
2 | this.workbox.expiration = (function (exports, DBWrapper_mjs, deleteDatabase_mjs, WorkboxError_mjs, assert_mjs, logger_mjs, cacheNames_mjs, getFriendlyURL_mjs, registerQuotaErrorCallback_mjs) {
|
3 | ;
|
4 |
|
5 | try {
|
6 | self['workbox:expiration:4.1.1'] && _();
|
7 | } catch (e) {} // eslint-disable-line
|
8 |
|
9 | /*
|
10 | Copyright 2018 Google LLC
|
11 |
|
12 | Use of this source code is governed by an MIT-style
|
13 | license that can be found in the LICENSE file or at
|
14 | https://opensource.org/licenses/MIT.
|
15 | */
|
16 | const DB_NAME = 'workbox-expiration';
|
17 | const OBJECT_STORE_NAME = 'cache-entries';
|
18 |
|
19 | const normalizeURL = unNormalizedUrl => {
|
20 | const url = new URL(unNormalizedUrl, location);
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21 | url.hash = '';
|
22 | return url.href;
|
23 | };
|
24 | /**
|
25 | * Returns the timestamp model.
|
26 | *
|
27 | * @private
|
28 | */
|
29 |
|
30 |
|
31 | class CacheTimestampsModel {
|
32 | /**
|
33 | *
|
34 | * @param {string} cacheName
|
35 | *
|
36 | * @private
|
37 | */
|
38 | constructor(cacheName) {
|
39 | this._cacheName = cacheName;
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40 | this._db = new DBWrapper_mjs.DBWrapper(DB_NAME, 1, {
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41 | onupgradeneeded: event => this._handleUpgrade(event)
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42 | });
|
43 | }
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44 | /**
|
45 | * Should perform an upgrade of indexedDB.
|
46 | *
|
47 | * @param {Event} event
|
48 | *
|
49 | * @private
|
50 | */
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51 |
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52 |
|
53 | _handleUpgrade(event) {
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54 | const db = event.target.result; // TODO(philipwalton): EdgeHTML doesn't support arrays as a keyPath, so we
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55 | // have to use the `id` keyPath here and create our own values (a
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56 | // concatenation of `url + cacheName`) instead of simply using
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57 | // `keyPath: ['url', 'cacheName']`, which is supported in other browsers.
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58 |
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59 | const objStore = db.createObjectStore(OBJECT_STORE_NAME, {
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60 | keyPath: 'id'
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61 | }); // TODO(philipwalton): once we don't have to support EdgeHTML, we can
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62 | // create a single index with the keyPath `['cacheName', 'timestamp']`
|
63 | // instead of doing both these indexes.
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64 |
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65 | objStore.createIndex('cacheName', 'cacheName', {
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66 | unique: false
|
67 | });
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68 | objStore.createIndex('timestamp', 'timestamp', {
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69 | unique: false
|
70 | }); // Previous versions of `workbox-expiration` used `this._cacheName`
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71 | // as the IDBDatabase name.
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72 |
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73 | deleteDatabase_mjs.deleteDatabase(this._cacheName);
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74 | }
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75 | /**
|
76 | * @param {string} url
|
77 | * @param {number} timestamp
|
78 | *
|
79 | * @private
|
80 | */
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81 |
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82 |
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83 | async setTimestamp(url, timestamp) {
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84 | url = normalizeURL(url);
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85 | await this._db.put(OBJECT_STORE_NAME, {
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86 | url,
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87 | timestamp,
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88 | cacheName: this._cacheName,
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89 | // Creating an ID from the URL and cache name won't be necessary once
|
90 | // Edge switches to Chromium and all browsers we support work with
|
91 | // array keyPaths.
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92 | id: this._getId(url)
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93 | });
|
94 | }
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95 | /**
|
96 | * Returns the timestamp stored for a given URL.
|
97 | *
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98 | * @param {string} url
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99 | * @return {number}
|
100 | *
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101 | * @private
|
102 | */
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103 |
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104 |
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105 | async getTimestamp(url) {
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106 | const entry = await this._db.get(OBJECT_STORE_NAME, this._getId(url));
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107 | return entry.timestamp;
|
108 | }
|
109 | /**
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110 | * Iterates through all the entries in the object store (from newest to
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111 | * oldest) and removes entries once either `maxCount` is reached or the
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112 | * entry's timestamp is less than `minTimestamp`.
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113 | *
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114 | * @param {number} minTimestamp
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115 | * @param {number} maxCount
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116 | *
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117 | * @private
|
118 | */
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119 |
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120 |
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121 | async expireEntries(minTimestamp, maxCount) {
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122 | return await this._db.transaction(OBJECT_STORE_NAME, 'readwrite', (txn, done) => {
|
123 | const store = txn.objectStore(OBJECT_STORE_NAME);
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124 | const entriesDeleted = [];
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125 | let entriesNotDeletedCount = 0;
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126 |
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127 | store.index('timestamp').openCursor(null, 'prev').onsuccess = ({
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128 | target
|
129 | }) => {
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130 | const cursor = target.result;
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131 |
|
132 | if (cursor) {
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133 | const result = cursor.value; // TODO(philipwalton): once we can use a multi-key index, we
|
134 | // won't have to check `cacheName` here.
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135 |
|
136 | if (result.cacheName === this._cacheName) {
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137 | // Delete an entry if it's older than the max age or
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138 | // if we already have the max number allowed.
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139 | if (minTimestamp && result.timestamp < minTimestamp || maxCount && entriesNotDeletedCount >= maxCount) {
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140 | cursor.delete(); // We only need to return the URL, not the whole entry.
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141 |
|
142 | entriesDeleted.push(cursor.value.url);
|
143 | } else {
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144 | entriesNotDeletedCount++;
|
145 | }
|
146 | }
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147 |
|
148 | cursor.continue();
|
149 | } else {
|
150 | done(entriesDeleted);
|
151 | }
|
152 | };
|
153 | });
|
154 | }
|
155 | /**
|
156 | * Takes a URL and returns an ID that will be unique in the object store.
|
157 | *
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158 | * @param {string} url
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159 | * @return {string}
|
160 | */
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161 |
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162 |
|
163 | _getId(url) {
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164 | // Creating an ID from the URL and cache name won't be necessary once
|
165 | // Edge switches to Chromium and all browsers we support work with
|
166 | // array keyPaths.
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167 | return this._cacheName + '|' + normalizeURL(url);
|
168 | }
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169 |
|
170 | }
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171 |
|
172 | /*
|
173 | Copyright 2018 Google LLC
|
174 |
|
175 | Use of this source code is governed by an MIT-style
|
176 | license that can be found in the LICENSE file or at
|
177 | https://opensource.org/licenses/MIT.
|
178 | */
|
179 | /**
|
180 | * The `CacheExpiration` class allows you define an expiration and / or
|
181 | * limit on the number of responses stored in a
|
182 | * [`Cache`](https://developer.mozilla.org/en-US/docs/Web/API/Cache).
|
183 | *
|
184 | * @memberof workbox.expiration
|
185 | */
|
186 |
|
187 | class CacheExpiration {
|
188 | /**
|
189 | * To construct a new CacheExpiration instance you must provide at least
|
190 | * one of the `config` properties.
|
191 | *
|
192 | * @param {string} cacheName Name of the cache to apply restrictions to.
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193 | * @param {Object} config
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194 | * @param {number} [config.maxEntries] The maximum number of entries to cache.
|
195 | * Entries used the least will be removed as the maximum is reached.
|
196 | * @param {number} [config.maxAgeSeconds] The maximum age of an entry before
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197 | * it's treated as stale and removed.
|
198 | */
|
199 | constructor(cacheName, config = {}) {
|
200 | {
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201 | assert_mjs.assert.isType(cacheName, 'string', {
|
202 | moduleName: 'workbox-expiration',
|
203 | className: 'CacheExpiration',
|
204 | funcName: 'constructor',
|
205 | paramName: 'cacheName'
|
206 | });
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207 |
|
208 | if (!(config.maxEntries || config.maxAgeSeconds)) {
|
209 | throw new WorkboxError_mjs.WorkboxError('max-entries-or-age-required', {
|
210 | moduleName: 'workbox-expiration',
|
211 | className: 'CacheExpiration',
|
212 | funcName: 'constructor'
|
213 | });
|
214 | }
|
215 |
|
216 | if (config.maxEntries) {
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217 | assert_mjs.assert.isType(config.maxEntries, 'number', {
|
218 | moduleName: 'workbox-expiration',
|
219 | className: 'CacheExpiration',
|
220 | funcName: 'constructor',
|
221 | paramName: 'config.maxEntries'
|
222 | }); // TODO: Assert is positive
|
223 | }
|
224 |
|
225 | if (config.maxAgeSeconds) {
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226 | assert_mjs.assert.isType(config.maxAgeSeconds, 'number', {
|
227 | moduleName: 'workbox-expiration',
|
228 | className: 'CacheExpiration',
|
229 | funcName: 'constructor',
|
230 | paramName: 'config.maxAgeSeconds'
|
231 | }); // TODO: Assert is positive
|
232 | }
|
233 | }
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234 |
|
235 | this._isRunning = false;
|
236 | this._rerunRequested = false;
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237 | this._maxEntries = config.maxEntries;
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238 | this._maxAgeSeconds = config.maxAgeSeconds;
|
239 | this._cacheName = cacheName;
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240 | this._timestampModel = new CacheTimestampsModel(cacheName);
|
241 | }
|
242 | /**
|
243 | * Expires entries for the given cache and given criteria.
|
244 | */
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245 |
|
246 |
|
247 | async expireEntries() {
|
248 | if (this._isRunning) {
|
249 | this._rerunRequested = true;
|
250 | return;
|
251 | }
|
252 |
|
253 | this._isRunning = true;
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254 | const minTimestamp = this._maxAgeSeconds ? Date.now() - this._maxAgeSeconds * 1000 : undefined;
|
255 | const urlsExpired = await this._timestampModel.expireEntries(minTimestamp, this._maxEntries); // Delete URLs from the cache
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256 |
|
257 | const cache = await caches.open(this._cacheName);
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258 |
|
259 | for (const url of urlsExpired) {
|
260 | await cache.delete(url);
|
261 | }
|
262 |
|
263 | {
|
264 | if (urlsExpired.length > 0) {
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265 | logger_mjs.logger.groupCollapsed(`Expired ${urlsExpired.length} ` + `${urlsExpired.length === 1 ? 'entry' : 'entries'} and removed ` + `${urlsExpired.length === 1 ? 'it' : 'them'} from the ` + `'${this._cacheName}' cache.`);
|
266 | logger_mjs.logger.log(`Expired the following ${urlsExpired.length === 1 ? 'URL' : 'URLs'}:`);
|
267 | urlsExpired.forEach(url => logger_mjs.logger.log(` ${url}`));
|
268 | logger_mjs.logger.groupEnd();
|
269 | } else {
|
270 | logger_mjs.logger.debug(`Cache expiration ran and found no entries to remove.`);
|
271 | }
|
272 | }
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273 |
|
274 | this._isRunning = false;
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275 |
|
276 | if (this._rerunRequested) {
|
277 | this._rerunRequested = false;
|
278 | this.expireEntries();
|
279 | }
|
280 | }
|
281 | /**
|
282 | * Update the timestamp for the given URL. This ensures the when
|
283 | * removing entries based on maximum entries, most recently used
|
284 | * is accurate or when expiring, the timestamp is up-to-date.
|
285 | *
|
286 | * @param {string} url
|
287 | */
|
288 |
|
289 |
|
290 | async updateTimestamp(url) {
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291 | {
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292 | assert_mjs.assert.isType(url, 'string', {
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293 | moduleName: 'workbox-expiration',
|
294 | className: 'CacheExpiration',
|
295 | funcName: 'updateTimestamp',
|
296 | paramName: 'url'
|
297 | });
|
298 | }
|
299 |
|
300 | await this._timestampModel.setTimestamp(url, Date.now());
|
301 | }
|
302 | /**
|
303 | * Can be used to check if a URL has expired or not before it's used.
|
304 | *
|
305 | * This requires a look up from IndexedDB, so can be slow.
|
306 | *
|
307 | * Note: This method will not remove the cached entry, call
|
308 | * `expireEntries()` to remove indexedDB and Cache entries.
|
309 | *
|
310 | * @param {string} url
|
311 | * @return {boolean}
|
312 | */
|
313 |
|
314 |
|
315 | async isURLExpired(url) {
|
316 | {
|
317 | if (!this._maxAgeSeconds) {
|
318 | throw new WorkboxError_mjs.WorkboxError(`expired-test-without-max-age`, {
|
319 | methodName: 'isURLExpired',
|
320 | paramName: 'maxAgeSeconds'
|
321 | });
|
322 | }
|
323 | }
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324 |
|
325 | const timestamp = await this._timestampModel.getTimestamp(url);
|
326 | const expireOlderThan = Date.now() - this._maxAgeSeconds * 1000;
|
327 | return timestamp < expireOlderThan;
|
328 | }
|
329 | /**
|
330 | * Removes the IndexedDB object store used to keep track of cache expiration
|
331 | * metadata.
|
332 | */
|
333 |
|
334 |
|
335 | async delete() {
|
336 | // Make sure we don't attempt another rerun if we're called in the middle of
|
337 | // a cache expiration.
|
338 | this._rerunRequested = false;
|
339 | await this._timestampModel.expireEntries(Infinity); // Expires all.
|
340 | }
|
341 |
|
342 | }
|
343 |
|
344 | /*
|
345 | Copyright 2018 Google LLC
|
346 |
|
347 | Use of this source code is governed by an MIT-style
|
348 | license that can be found in the LICENSE file or at
|
349 | https://opensource.org/licenses/MIT.
|
350 | */
|
351 | /**
|
352 | * This plugin can be used in the Workbox APIs to regularly enforce a
|
353 | * limit on the age and / or the number of cached requests.
|
354 | *
|
355 | * Whenever a cached request is used or updated, this plugin will look
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356 | * at the used Cache and remove any old or extra requests.
|
357 | *
|
358 | * When using `maxAgeSeconds`, requests may be used *once* after expiring
|
359 | * because the expiration clean up will not have occurred until *after* the
|
360 | * cached request has been used. If the request has a "Date" header, then
|
361 | * a light weight expiration check is performed and the request will not be
|
362 | * used immediately.
|
363 | *
|
364 | * When using `maxEntries`, the last request to be used will be the request
|
365 | * that is removed from the Cache.
|
366 | *
|
367 | * @memberof workbox.expiration
|
368 | */
|
369 |
|
370 | class Plugin {
|
371 | /**
|
372 | * @param {Object} config
|
373 | * @param {number} [config.maxEntries] The maximum number of entries to cache.
|
374 | * Entries used the least will be removed as the maximum is reached.
|
375 | * @param {number} [config.maxAgeSeconds] The maximum age of an entry before
|
376 | * it's treated as stale and removed.
|
377 | * @param {boolean} [config.purgeOnQuotaError] Whether to opt this cache in to
|
378 | * automatic deletion if the available storage quota has been exceeded.
|
379 | */
|
380 | constructor(config = {}) {
|
381 | {
|
382 | if (!(config.maxEntries || config.maxAgeSeconds)) {
|
383 | throw new WorkboxError_mjs.WorkboxError('max-entries-or-age-required', {
|
384 | moduleName: 'workbox-expiration',
|
385 | className: 'Plugin',
|
386 | funcName: 'constructor'
|
387 | });
|
388 | }
|
389 |
|
390 | if (config.maxEntries) {
|
391 | assert_mjs.assert.isType(config.maxEntries, 'number', {
|
392 | moduleName: 'workbox-expiration',
|
393 | className: 'Plugin',
|
394 | funcName: 'constructor',
|
395 | paramName: 'config.maxEntries'
|
396 | });
|
397 | }
|
398 |
|
399 | if (config.maxAgeSeconds) {
|
400 | assert_mjs.assert.isType(config.maxAgeSeconds, 'number', {
|
401 | moduleName: 'workbox-expiration',
|
402 | className: 'Plugin',
|
403 | funcName: 'constructor',
|
404 | paramName: 'config.maxAgeSeconds'
|
405 | });
|
406 | }
|
407 | }
|
408 |
|
409 | this._config = config;
|
410 | this._maxAgeSeconds = config.maxAgeSeconds;
|
411 | this._cacheExpirations = new Map();
|
412 |
|
413 | if (config.purgeOnQuotaError) {
|
414 | registerQuotaErrorCallback_mjs.registerQuotaErrorCallback(() => this.deleteCacheAndMetadata());
|
415 | }
|
416 | }
|
417 | /**
|
418 | * A simple helper method to return a CacheExpiration instance for a given
|
419 | * cache name.
|
420 | *
|
421 | * @param {string} cacheName
|
422 | * @return {CacheExpiration}
|
423 | *
|
424 | * @private
|
425 | */
|
426 |
|
427 |
|
428 | _getCacheExpiration(cacheName) {
|
429 | if (cacheName === cacheNames_mjs.cacheNames.getRuntimeName()) {
|
430 | throw new WorkboxError_mjs.WorkboxError('expire-custom-caches-only');
|
431 | }
|
432 |
|
433 | let cacheExpiration = this._cacheExpirations.get(cacheName);
|
434 |
|
435 | if (!cacheExpiration) {
|
436 | cacheExpiration = new CacheExpiration(cacheName, this._config);
|
437 |
|
438 | this._cacheExpirations.set(cacheName, cacheExpiration);
|
439 | }
|
440 |
|
441 | return cacheExpiration;
|
442 | }
|
443 | /**
|
444 | * A "lifecycle" callback that will be triggered automatically by the
|
445 | * `workbox.strategies` handlers when a `Response` is about to be returned
|
446 | * from a [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache) to
|
447 | * the handler. It allows the `Response` to be inspected for freshness and
|
448 | * prevents it from being used if the `Response`'s `Date` header value is
|
449 | * older than the configured `maxAgeSeconds`.
|
450 | *
|
451 | * @param {Object} options
|
452 | * @param {string} options.cacheName Name of the cache the response is in.
|
453 | * @param {Response} options.cachedResponse The `Response` object that's been
|
454 | * read from a cache and whose freshness should be checked.
|
455 | * @return {Response} Either the `cachedResponse`, if it's
|
456 | * fresh, or `null` if the `Response` is older than `maxAgeSeconds`.
|
457 | *
|
458 | * @private
|
459 | */
|
460 |
|
461 |
|
462 | cachedResponseWillBeUsed({
|
463 | event,
|
464 | request,
|
465 | cacheName,
|
466 | cachedResponse
|
467 | }) {
|
468 | if (!cachedResponse) {
|
469 | return null;
|
470 | }
|
471 |
|
472 | let isFresh = this._isResponseDateFresh(cachedResponse); // Expire entries to ensure that even if the expiration date has
|
473 | // expired, it'll only be used once.
|
474 |
|
475 |
|
476 | const cacheExpiration = this._getCacheExpiration(cacheName);
|
477 |
|
478 | cacheExpiration.expireEntries(); // Update the metadata for the request URL to the current timestamp,
|
479 | // but don't `await` it as we don't want to block the response.
|
480 |
|
481 | const updateTimestampDone = cacheExpiration.updateTimestamp(request.url);
|
482 |
|
483 | if (event) {
|
484 | try {
|
485 | event.waitUntil(updateTimestampDone);
|
486 | } catch (error) {
|
487 | {
|
488 | logger_mjs.logger.warn(`Unable to ensure service worker stays alive when ` + `updating cache entry for '${getFriendlyURL_mjs.getFriendlyURL(event.request.url)}'.`);
|
489 | }
|
490 | }
|
491 | }
|
492 |
|
493 | return isFresh ? cachedResponse : null;
|
494 | }
|
495 | /**
|
496 | * @param {Response} cachedResponse
|
497 | * @return {boolean}
|
498 | *
|
499 | * @private
|
500 | */
|
501 |
|
502 |
|
503 | _isResponseDateFresh(cachedResponse) {
|
504 | if (!this._maxAgeSeconds) {
|
505 | // We aren't expiring by age, so return true, it's fresh
|
506 | return true;
|
507 | } // Check if the 'date' header will suffice a quick expiration check.
|
508 | // See https://github.com/GoogleChromeLabs/sw-toolbox/issues/164 for
|
509 | // discussion.
|
510 |
|
511 |
|
512 | const dateHeaderTimestamp = this._getDateHeaderTimestamp(cachedResponse);
|
513 |
|
514 | if (dateHeaderTimestamp === null) {
|
515 | // Unable to parse date, so assume it's fresh.
|
516 | return true;
|
517 | } // If we have a valid headerTime, then our response is fresh iff the
|
518 | // headerTime plus maxAgeSeconds is greater than the current time.
|
519 |
|
520 |
|
521 | const now = Date.now();
|
522 | return dateHeaderTimestamp >= now - this._maxAgeSeconds * 1000;
|
523 | }
|
524 | /**
|
525 | * This method will extract the data header and parse it into a useful
|
526 | * value.
|
527 | *
|
528 | * @param {Response} cachedResponse
|
529 | * @return {number}
|
530 | *
|
531 | * @private
|
532 | */
|
533 |
|
534 |
|
535 | _getDateHeaderTimestamp(cachedResponse) {
|
536 | if (!cachedResponse.headers.has('date')) {
|
537 | return null;
|
538 | }
|
539 |
|
540 | const dateHeader = cachedResponse.headers.get('date');
|
541 | const parsedDate = new Date(dateHeader);
|
542 | const headerTime = parsedDate.getTime(); // If the Date header was invalid for some reason, parsedDate.getTime()
|
543 | // will return NaN.
|
544 |
|
545 | if (isNaN(headerTime)) {
|
546 | return null;
|
547 | }
|
548 |
|
549 | return headerTime;
|
550 | }
|
551 | /**
|
552 | * A "lifecycle" callback that will be triggered automatically by the
|
553 | * `workbox.strategies` handlers when an entry is added to a cache.
|
554 | *
|
555 | * @param {Object} options
|
556 | * @param {string} options.cacheName Name of the cache that was updated.
|
557 | * @param {string} options.request The Request for the cached entry.
|
558 | *
|
559 | * @private
|
560 | */
|
561 |
|
562 |
|
563 | async cacheDidUpdate({
|
564 | cacheName,
|
565 | request
|
566 | }) {
|
567 | {
|
568 | assert_mjs.assert.isType(cacheName, 'string', {
|
569 | moduleName: 'workbox-expiration',
|
570 | className: 'Plugin',
|
571 | funcName: 'cacheDidUpdate',
|
572 | paramName: 'cacheName'
|
573 | });
|
574 | assert_mjs.assert.isInstance(request, Request, {
|
575 | moduleName: 'workbox-expiration',
|
576 | className: 'Plugin',
|
577 | funcName: 'cacheDidUpdate',
|
578 | paramName: 'request'
|
579 | });
|
580 | }
|
581 |
|
582 | const cacheExpiration = this._getCacheExpiration(cacheName);
|
583 |
|
584 | await cacheExpiration.updateTimestamp(request.url);
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585 | await cacheExpiration.expireEntries();
|
586 | }
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587 | /**
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588 | * This is a helper method that performs two operations:
|
589 | *
|
590 | * - Deletes *all* the underlying Cache instances associated with this plugin
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591 | * instance, by calling caches.delete() on your behalf.
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592 | * - Deletes the metadata from IndexedDB used to keep track of expiration
|
593 | * details for each Cache instance.
|
594 | *
|
595 | * When using cache expiration, calling this method is preferable to calling
|
596 | * `caches.delete()` directly, since this will ensure that the IndexedDB
|
597 | * metadata is also cleanly removed and open IndexedDB instances are deleted.
|
598 | *
|
599 | * Note that if you're *not* using cache expiration for a given cache, calling
|
600 | * `caches.delete()` and passing in the cache's name should be sufficient.
|
601 | * There is no Workbox-specific method needed for cleanup in that case.
|
602 | */
|
603 |
|
604 |
|
605 | async deleteCacheAndMetadata() {
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606 | // Do this one at a time instead of all at once via `Promise.all()` to
|
607 | // reduce the chance of inconsistency if a promise rejects.
|
608 | for (const [cacheName, cacheExpiration] of this._cacheExpirations) {
|
609 | await caches.delete(cacheName);
|
610 | await cacheExpiration.delete();
|
611 | } // Reset this._cacheExpirations to its initial state.
|
612 |
|
613 |
|
614 | this._cacheExpirations = new Map();
|
615 | }
|
616 |
|
617 | }
|
618 |
|
619 | /*
|
620 | Copyright 2018 Google LLC
|
621 |
|
622 | Use of this source code is governed by an MIT-style
|
623 | license that can be found in the LICENSE file or at
|
624 | https://opensource.org/licenses/MIT.
|
625 | */
|
626 |
|
627 | exports.CacheExpiration = CacheExpiration;
|
628 | exports.Plugin = Plugin;
|
629 |
|
630 | return exports;
|
631 |
|
632 | }({}, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core));
|
633 |
|